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77 results for “Posidonia”
Future Projections for Posidonia oceanica and Zostera marina in Europe
<p>Future projections of seagrass biomass for <em>Posidonia oceanica</em> and <em>Zostera marina </em>in Europe.</p> <p>Supporting data for T4.1 of Horizon 2020 project FutureMARES.</p> <p>The file naming convention is {species}_{cmip6_model}_{ssp}, where <em>species</em> identifies whether the model run is for <em>P. oceanica</em> or <em>Z. marina</em>, <em>cmip6_model</em> names the CMIP6 model uses to drive the projections, and <em>ssp</em> identifies which of SSP126, SSP245 and SSP585 were used.</p> <p>Projections cover the year 1995-2099.</p> <p> </p>
Data for the study of Posidonia microbial nitrogen metabolism manuscript
<p>These are data related to the study of the seagrass microbiome and function. <em>Posidonia oceanica</em>, an endemic seagrass species that dominates the Mediterranean Sea, achieves high abundances in seawater with relatively low concentrations of dissolved inorganic nitrogen. Here we test whether microbial metabolisms associated with <em>P. oceanica</em> and surrounding seawater enhance seagrass access to nitrogen. Using stable isotope enrichments of intact seagrass with amino acids, we show that ammonification by free-living and seagrass-associated microbes produce ammonium that is likely used by seagrass and surrounding particulate organic matter. Metagenomic analysis of the epiphytic biofilm on the blades and rhizomes support the ubiquity of microbial ammonification genes in this system. Further, we leveraged the presence of natural carbon dioxide vents and show that microbial ammonification was reduced at lower pH. The presence of <em>P. oceanica</em> enhanced the uptake of nitrogen by water column particulate organic matter, increasing carbon fixation by a factor of 8.6 to 17.4 with the greatest effect at CO<sub>2</sub> vent sites. Seagrass and its microbial associates thus enhanced water column productivity and were a locus for nutrient cycling.</p>
Combined exposure to CO2 and H2S significantly reduces the performance of the Mediterranean seagrass Posidonia oceanica: evidence from a volcanic CO2 vent
<p>The dataset is an excel file consisting of six sheets. The associated metadata file contains the description and other information about the dataset</p>
Figure 4 in Patterns of spatial variability of mobile macro-invertebrate assemblages within a Posidonia oceanica meadow
Figure 4. Non-metric multidimensional scaling (nMDS) ordination on macro-invertebrate assemblages of Pianosa Island. S = shallow, I = intermediate, D = deep; e = east, s = south, w = west.
Figure 3 in Patterns of spatial variability of mobile macro-invertebrate assemblages within a Posidonia oceanica meadow
Figure 3. (a) Mean species number and (b) number of individuals per sample of mobile macroinvertebrate assemblages of Posidonia oceanica meadow (mean ± standard error, SE; n = 24).
Figure 2 in Patterns of spatial variability of mobile macro-invertebrate assemblages within a Posidonia oceanica meadow
Figure 2. (a) Shoot density and (b) mean leaf length of Posidonia oceanica meadow of Pianosa Island (mean ± standard error, SE; n = 120).
Fig. 8 in In situ experiments on the effect of low pH on the ultrastructure of the seagrasses Cymodocea nodosa and Posidonia oceanica Abstract
Fig. 8: A-H. TEM micrographs of young epidermal cells of C. nodosa after three weeks transfer at S2 area. A. Surface view of epidermal cells. They are disorganized and most of the organelles are not easily seen. B. Epidermal cell with wavy cell walls and a central nucleus with loose and partially disrupted nuclear membrane. C. A group of peripherally distributed mitochondria containing a rather amorphous mass of destroyed cristae. D. Dictyosome with rounded and loose cisternae. E. Disorganized chloroplasts with remnants of thylakoids and starch grains. F. Cortical cytoplasmic area with disorganized mitochondria and inflated ER fragments. G. Higher magnification of inflated fragments of RER with attached electron-dense material. H. ER membrane-like network with projecting edges filled with electron-dense material. Scale bars = 2 μm (A), 1μm (B) 0.5μm (C), 0.2 (D, E, F) and 0.1 (G, H).
Fig. 6 in In situ experiments on the effect of low pH on the ultrastructure of the seagrasses Cymodocea nodosa and Posidonia oceanica Abstract
Fig. 6: A-E. TEM micrographs of young epidermal cells of C. nodosa after three weeks transfer at S1 area. A. Group of epidermal cells that appear empty, with most of the cell elements disorganized and distorted. B. Higher magnification of a nucleus with condensed masses of chromatin which covered most of the nucleoplasm. The nuclear membrane appears loose and discontinuous. C. Cytoplasmic area showing dictyosomes with few cisternae and numerous swollen fragments of rough ER (RER) D. Fragmented ER membranes traversing the cortical cytoplasm. E. Disorganized chloroplasts with large starch grains surrounded by a system of electron-dense elongated or round plastoglobuli. Mitochondria with a few broken and sometimes dilated cristae are also observed. Scale bars = 1 μm (A), 0.5μm (B, C, E) and 0.2μm (D).
Fig. 5 in In situ experiments on the effect of low pH on the ultrastructure of the seagrasses Cymodocea nodosa and Posidonia oceanica Abstract
Fig. 5: A-C. TEM micrographs of young epidermal cells of P. oceanica after one week transfer at S2 area. A. Epidermal cell with increased number of chloroplasts and mitochondria. B. Chloroplast with oval-shaped and rod-like plastoglobuli around starch grains. Mitochondria with very few fragmented cristae are also visible. C. Dictyosomes and fragmented ER network extended along the cell periphery. Scale bars = 1 μm (A), and 0.5μm (B, C).
Fig. 9 in In situ experiments on the effect of low pH on the ultrastructure of the seagrasses Cymodocea nodosa and Posidonia oceanica Abstract
Fig. 9: A-F. TEM micrographs of young epidermal cells of P. oceanica after three weeks transfer at S2 area. A. Group of epidermal cells that appear distorted, with wavy cell walls. B. Part of an epidermal cell with a central nucleus with disorganized nuclear membrane. The nucleus is surrounded by remnants of cell organelles and an electron-dense ER network. C. Chloroplasts with remnants of thylakoids and plastoglobuli, and disorganized mitochondria. Both appear empty and destroyed. D. Starch grains from disorganized chloroplasts appear dispersed in the cytoplasm. E. Cytoplasmic area with structures of ER network connected and/or filled with electron-dense material. F. Higher magnification of inflated, swollen RER cisternae, filled with electron-dense material. Scale bars = 2 μm (A), 1μm (B) 0.2 (C, D, E,) and 0.1 (F).
Fig. 1 in In situ experiments on the effect of low pH on the ultrastructure of the seagrasses Cymodocea nodosa and Posidonia oceanica Abstract
Fig. 1: A-E. TEM micrographs of young epidermal cells of C. nodosa control material. A. Paradermal section of an epidermal cell. Note its orthogonal shape, the dense cytoplasm, and the large nucleus occupying most of the cell space. B. Higher magnification of the peripheral part of the cell of Fig. A, showing the cell wall and cortical endoplasmic reticulum (ER). C. Cytoplasmic area taken from a plant transferred for one week to S1 area. Note the increased number of mitochondria, dictyosomes and ER, compared to the control. D. Epidermal cell after transfer for one week from S1. It shows a prominent central nucleus, undifferentiated chloroplasts with few grana and an increased number of mitochondria and ER membranes. E. Higher magnification of a cortical cytoplasmic area of a cell like D showing an extended ER network distributed in the cell periphery. Scale bars = 2 μm (A), 1μm (D) and 0.2μm (B, C, E).
Fig. 3 in In situ experiments on the effect of low pH on the ultrastructure of the seagrasses Cymodocea nodosa and Posidonia oceanica Abstract
Fig. 3: A-E. Interphase epidermal cells of young leaves under different pH levels. In all figures, green represents tubulin immunofluorescence and blue represents Hoechst staining of DNA. A. Transfer of CN to pH 7.8 for 1 week: thick MT bundles showing a slightly aberrant orientation. B. Transfer of PO to pH 7.8 for 1 week: MT bundles oriented perpendicularly to the long leaf axis. C. Transfer of CN to pH 6.8 for 1 week: fragmented MT bundles with slightly aberrant orientations. D. Transfer of CN to pH 7.8 for 3 weeks: short, fragmented, and curved MT bundles with aberrant orientations. E. Transfer of PO at pH 7.8 for 3 weeks: depolymerization and disassembly of interphase MTs with loss of proper orientation. Scale bar = 10 μm.
Fig. 4 in In situ experiments on the effect of low pH on the ultrastructure of the seagrasses Cymodocea nodosa and Posidonia oceanica Abstract
Fig. 4: A-C. TEM micrographs of young epidermal cells of C. nodosa after one week transfer at S2 area. A. Epidermal cell with undifferentiated chloroplasts and increased number of mitochondria. B. Higher magnification of a chloroplast with a few developing grana. C. Higher magnification of a mitochondrion with very few cristae. Scale bars = 0.5 μm (A, B, C).
Fig. 7 in In situ experiments on the effect of low pH on the ultrastructure of the seagrasses Cymodocea nodosa and Posidonia oceanica Abstract
Fig. 7: A-D. TEM micrographs of young epidermal cells of P. oceanica after three weeks transfer at S1 area. A. Part of an epidermal cell of P. oceanica with warped cell walls, distorted cytoplasm, and a large nucleus with condensed chromatin masses. B. Chloroplast with remnants of disorganized cisternae and round plastoglobuli. C. Chloroplasts with large starch grains surrounded by a system of electron-dense elongated and/or round plastoglobuli. Mitochondria with a few broken dilated cristae are visible. D. Fragmented ER membranes arranged along the cell periphery. Scale bars = 1 μm (A), 0.5μm (B, C) and 0.2μm (D).
Fig. 5 in Effects of ocean acidification on phenology and epiphytes of the seagrass Posidonia oceanica at two CO vent systems of Ischia (Italy) Abstract
Fig. 5: Temporal evolution of the coverage percentage of the epiphytic assemblages (June, August, and October) at the studied stations.
Fig. 6 in Effects of ocean acidification on phenology and epiphytes of the seagrass Posidonia oceanica at two CO vent systems of Ischia (Italy) Abstract
Fig. 6: Non-metric multidimensional scaling (nMDS) plot of the epiphytic assemblages: a) June (stress = 0.16); b) August (stress = 0.15); c) October (stress = 0.12); d) three months plotted together (stress = 0.25) to highlight the evolution of the community over time. Circles indicate N3, empty triangles indicate Vu3; inverse filled triangles indicate Vu6; quadrats identify the control (NC). Colors indicate sampling month: black = June; dark gray = August; and light gray = October.
Fig. 1 in Effects of ocean acidification on phenology and epiphytes of the seagrass Posidonia oceanica at two CO vent systems of Ischia (Italy) Abstract
Fig. 1: Map of the study area (Ischia, Italy) showing the locations of stations (N3, Vu3, Vu6, and the control). The table reports on the right corner which of the vent systems the station belongs to, the station's identification code (ID), the depth, and the mean ± SD of pH measured.
Fig. 3 in Effects of ocean acidification on phenology and epiphytes of the seagrass Posidonia oceanica at two CO vent systems of Ischia (Italy) Abstract
Fig. 3: Percentage of leaves showing different types of leaf apex erosion (intact, mechanical, and biological) over time at the studied stations. At least 30 of the oldest leaves were examined at each month and station.
Fig. 4 in Effects of ocean acidification on phenology and epiphytes of the seagrass Posidonia oceanica at two CO vent systems of Ischia (Italy) Abstract
Fig. 4: Percentage of different types of biological apex erosion (Sarpa salpa, sea urchins, and crustaceans) during time at the studied stations and considering only the leaves showing biological erosion.
Fig. 2 in Effects of ocean acidification on phenology and epiphytes of the seagrass Posidonia oceanica at two CO vent systems of Ischia (Italy) Abstract
Fig. 2: Temporal variation in Posidonia oceanica morphological features at the studied stations: mean shoot density (a), mean number of leaves per shoot (b), and mean leaf length (c) and width (d). Bars represent the standard deviation. Gray colors indicate low pH conditions: N3 (pH 7.21 ± 0.34), Vu3, and Vu6 (pH 7.26 ± 0.48); and white indicates the control station (NC; pH 8.00 ± 0.08). Asterisks highlight features that show significant differences according to pH conditions.
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